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MSE PRO BK7 Plano-Concave Lenses w/ 1/4 Wave MgF2 Coating@550nm, Ø20mm– MSE Supplies LLC

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MSE PRO BK7 Plano-Concave Lenses with 1/4 Wave MgF<sub>2</sub> Coating@550nm, Ø20mm

MSE PRO BK7 Plano-Concave Lenses with 1/4 Wave MgF2 Coating@550nm, Ø20mm

SKU: ACB7PC5-20--30

  • £3300
  • Save £400

MSE PRO™ BK7 Plano-Concave Lenses with 1/4 Wave 

MgF2 Coating@550nm, Ø20mm

MSE supplies offers Ø20mm BK7 Plano-Concave Lenses with 1/4 Wave MgF2 Coating@550nm. It is a plano-concave lens diverges parallel input rays. It has a negative focal length. While the output rays do not actually meet to form a point, they do appear to be diverging from a virtual image located on the object side of the lens. At absolute conjugate ratio greater than 5:1 and less than 1:5, plano-concave lenses are nearly the best form lens to reduce spherical aberration, coma, and distortion. The curved surface of the lens should face the object in distance or infinite conjugate, except in a high energy laser system, this should be reversed to eliminate the possibility of a virtual focus.

MSE Supplies can offer a variety of optical elements, with different focal length and coating options. Please contact us for customization or bulk orders. 

Technical Data:

Material BK7 grade A, fine annealed
Diameter (Ø) Tolerance +0.0/-0.20
Center Thickness (Tc) ±0.1
Centration 3’
Form Error 1 ～ 5 fringes
Irregularity of Fringes 0.2 ～ 0.5 fringes
Surface Quality 60-40 scratch-dig
Clear Aperture 90% diameter